Her office said she has a full week of events scheduled in New Hampshire and that they will send advisories on Monday.

Brown, a former Massachusetts senator who permanently relocated to the neighboring Granite State this winter, announced in a Friday afternoon speech that he is creating an exploratory committee to challenge Shaheen.

Shaheen, meanwhile, sent a letter to Brown on Saturday calling on him to sign a “People’s Pledge” identical to the one that he agreed to with Democrat Elizabeth Warren in 2012. The pledge kept outside groups from spending money in the race.

“I hope you will join me in once again committing to the same People’s Pledge you signed in Massachusetts and limiting the influence of outside groups in New Hampshire this year,” Shaheen wrote in the letter, which her campaign manager emailed to Brown.

It comes one day after the conservative American Crossroads super PAC shared plans for a massive ad buy against her next week.

Brown responded by attacking Shaheen, noting that liberal groups have already been airing ads against him.

“Before I even thought of becoming a candidate, Jeanne Shaheen’s allies in Washington were running negative ads against me for months,” he said. “And right now, while I’m meeting with the people of New Hampshire, she is on the West Coast raising money so third-party groups in D.C. will have money to run more outside negative ads against me. It’s hard to view Jeanne Shaheen’s actions as anything other than hypocritical and self-serving.”

Brown’s Saturday New Hampshire schedule includes stops in Rochester, Wakefield, Dover, North Conway and Intervale.